New York Yankees: SP Manny Banuelos

Manny Banuelos has been one of the Yankees' top pitching prospects for a couple of years now, but his performance this season will not keep him there for long.

After pitching to a 4.19 ERA and 1.60 WHIP in a so-so debut in Triple-A last season, Banuelos has gotten off to a horrible start this year.

In his first two starts, he has given up 14 hits and seven walks in just 5.1 innings, leading to an insane 3.94 WHIP. The Yankees are always looking to add pieces to their team at the trading deadline, so if Banuelos continues to pitch in this fashion, they will be more willing to deal him than ever before.

Texas Rangers: SP Martin Perez

Martin Perez has been a rated as a top-100 prospect each of the last four years, starting the last three at Nos. 17, 24 and 31, respectively.

In spite of that, his performance at Triple-A has left many questions as to what his upside will be and when will he make the major leagues.

Don't get me wrong—the fact he made it to Triple-A last season at the age of 20 is an incredible accomplishment. However, since his promotion, he has a 5.68 ERA in 71.1 innings with a 1.71 WHIP and a SO/BB ratio of just 1.68.

Perez's career ERA above A-ball is 4.98, so it would not surprise me to see the Rangers dangle his name at the deadline as Texas tries to get over the hump and take home a World Series.

New York Yankees: SP Dellin Betances

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Dellin Betances is another name on this list that has finished in the top 100 of Baseball America's prospect rankings the last two seasons, but after scouts starting believing he would be better off in the bullpen, his stock has started to fall.

On top of that, his performance in Triple-A over the past year has been terrible.

In eight starts, Betances has a 6.81 ERA with 32 walks in 38.1 innings and a 1.80 WHIP. That lack of control is really hurting his value withing the Yankees organization.

Philadelphia Phillies: Of Domonic Brown

Domonic Brown has succeeded at every minor league level and even had his moments with the big club last year, but despite the Phillies' struggles to score runs, he cannot get out of Triple-A.

Brown has a career .293 average over seven minor league seasons, but after an off year last season where he only had five homers in 195 at-bats, his struggles have continued into this year. Brown still does not have a home run, and he is only hitting .263 while striking out in 21 percent of his plate appearances.

If Brown is unable to crack the Phillies roster ahead of the likes of Juan Pierre, his struggles in Triple-A do not bode well for his future in Philadelphia.